Machine tool feeding apparatus



7 vSheecs-Sheecl l July M9 1933- w. n.. SCHELLENBACH y MACHINE TOOL FEEDING APPARATUS lFiled oct. 10

Jlly u 1933- w. L. SCHELLENBACH 9l7905 MACHINE TOOL FEEDING APPARATUS Filed Oct. 10, 1930 Sheets-Sheet 2 `Bully l, w33. w scHELLENBAcH MACHINE TOOL FEEDING APPARATUS Filed OCT'. l0, 1950 '7 Sheets-Sheet 5 mNN.

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INVENTOR ATTORNEY MACHINE TOOL FEEDING APPARATUS Filed Oct. 10, 1950 7 Sheets-Sheet '4 INVENTOR ATTORNEY July 11, 1933- w. L. scHELLl-:NBACH' 1,917,905

MACHINE TOL FEEDING 'APPARATUS Filed oct. 1o, 195o 7 Sheets-Sheet 5 Mm@ im INVENTOR BY eww,

ATTORNEY July 11, 1933.

W. l.. SCH ELLENBACH MACHINE TOOL FEEING APPARATUS Filed Oct. 10, 1950 7 Sheets-Sheet 6 5i-99511999111 gfmmmm@ MEIHHELM@ M@ INVENTOR Y Y ATTORNEY 1930 7 Sheets-Sheet 7 W. L. SCHELLENBACH MACHINE TOOL FEEDING APPARATUS Filed Oct. 10

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INVENTOR )4f ATTORNEY Patented July 11, 1933 Y Y narran sii-Ares earner aerien VWILLIAM 1,.v scnrtrnnraaoa or ivro'riine, omo MACHINE. troon' Pennine APPARATUS Applicationv filed October'l, 1930. Serial No. 487,769.

My invention relates toA improvements in 3- 3- of FigY-illustrating the tool carriage machine tool driving and:l speed changing drivingv and speed changing mechanism. mechanism.. One: ofiits objects is to provide Figa` is adiagrammatic section through: improved toolt driving .andA speedA changing thetool carriage apron, 1llustrating in one 5 apparatus for lat-hes and other similar mah orizontalplane a portion of the `toollcar- 55 chinetools. Anotherobject istoprovide imliage driving and'speed changing mechaproved machine; tool driving and speed msm.` Y l Y changing mechanism in which practically all Fig. 5 -1s a vertical left' end elevationofthe the changes and adjustmentsareadapted to tool--arrl-age andapron. K be made Without'. leaving a position in front Flgj isa detailoi the apron`,.clutch,vsh1ft- 6 ofthe tool carriage apron. Another Objectis -lllgglcvcrfor reversing the eeds, d'etjached. to provide improved tool feeding and thread i* 1g'. ll ls a SiC-l@ GlGVlOIl' Showingm -detail ehasingapparatns. Another Objectis to propellon of the apron and clutch Shlftmg vide improved speedchanging: apparatus car'- lSVer Of'llg. 6,. Y Y riedby the tool'carriage controlling the tool 8 1S a scctlonat detail ot the apron 55* ,feed and. the thread chasing speed ratios. Sllltllg IGV?? fool? Stl'tlngand lstoppl'lflg;the Another object. is torprovide an improved feed. f Y Y. J speed changing apparatus carried. by the FuE- 9 1S 2111 @lli'illg'd plllzOflie OOQCM? tooly carriage controlling the tool feed and flge lIlClGX plate showing the ive spindle "o thread? chasing ratios, combined with posi Spee@ im@ ih@ thread {lhSlDg'OlDblIlatlolS: tive: reversingv mechanism. Another object Flgl0 1S @WGW Sln'lllar toFlg. @Showing is to provide improved and combined speed thUQX Platefdlusted to'mdlcflte th@ 1W@ changing'and startingl and stopping means SPmQle Speed ,Sellg Mld the '1;@01 ecdmg alliconta'ollablc from thetool'carriage. A11-v eombmadilols y 75 other object-is` to provide a shiftable index Flil 1S a SGCOD detfdllf lill@ feed platecarried. by the tool carriage and op- SCTW and nuts elgagmg Sad Screw', taken eratively connected With the change gear 0n im@ llll 0f 51g- 3" mechanism: adapted. to alternately indicate Fli- 1% 1S 3y Cle/tall 0f il, Potlon'of the t00l tooll feeding ratios and thread chasing ra- Carlg@ fedmg gear tram B07 tios depending upon Whether the driving 1S debl? t@ b9 ble milk@ all ille mechanism is set tovfeed the tool or to chase Sil-fis TWiki-d ft() Chang@ the Speed ofthe threads.. frnotherobject-is toprovide in comljlfllfinfue '50 Change. the Slgeeds 0f m3917001 bination With/speed changing live spindle 'eefla 'li-@wcimge thwspeeds; Ol h0 l(:f'Ch2lS- drivingmedmuslm Speedchangngtool en lng, and tongale ene Various starting` and 85 ringe driving.` mechanism, andspindle speed toplm" Slflg 0f the 1W? Spmdle: the. i001 Changing. and Spindle Stm-ting and Stopping reec l and tri-e thread chasing:'fr0-inp a single means operable fromthe tool carriage. My pofigbmp of @Pfff/Oil m frllltp the' 13001 invention alsoA comprises certain details oit' f-limg alilcuil' m ??'CLm toolspem" l form and arrangement and. combination ofI lfoef 11%.?? lir'iflc'blfui (flfpllcat uncles components,V all 'of which Will be fully set f'liip'llfg. Firmw- .lhqi Changes 'forth in the description or" the accompany- OQ i' l lei-ub limbs iqulgiqn quanmby ing drawinos in whch: `production is desned. ll/ ry improv-ed apel pio. I SUafI-font elevatin, of a lathe GHP paratusisadaptedto attainthese and other v important advantages.y f v 'e 4,2, bodylllg my mpl'ovementl TheY accompanying drawingsy illustrate F13? 2 1S m enlarged* Honig' elevatlon 0f. one embodimentof myinvention,` inxvvhich the 15001 Carmageand tod Carnage apron 0f 15 rc resent-s` a lathebedfl lathe WavsylS Flg* 1- Y Y i fafheadstocl housing in YWhich are journaled Fig Sis a horizontal section through the 'alive spindler` and apl'uralityof shafts' and .3h apronof' the tool carriage, taken on line speedchange gears and specd'change shiftm0 ing members adapted to drive said live spindle at relatively different rates of speed.

V v cylinder block 24.

, provided with a rotatably operable valve connected to and rotatable by a shaft 86 jour- A rock shaft is j ournaled in the headstock hou-sing 18, and is adapted to be rocked manually by means of avl hand lever 21y to shift one of said speed change `shifting members within the housing 18 to control the speed of the live spindle 19. A crank arm 22 attached to the rock shaft 2O is connected by a link 28 with the projecting end of a hydraulically operable piston 28 located within a cylinder block24, whereby the rock shaft 20 is adapted -to be hydraulically operated by the operator when positioned in front of the tool carriage. A rock shaft 25 is journaled in the headstock housing 18 and is manually operable by means of a hand lever 26. A crank arm 27 is also attachedto the rock shaft 25, and operatively connected by a link 28 with the projecting end of a piston rod 29 connected to a hydraulically operable piston mounted in a cylinder block 24. The rock shaft 25 is operatively connected within the headstock housing 18 with oneY of the live spindle speed changing members.

A rock shaft 30 is journaled in the headstock` housing 18, and manually operable by means of a hand lever 31. A crank arm 32 is also attached to the rock shaft 80, and is opera'- tively connected by a link 83 with the projecting end of a piston rod-34 attached to a hydraulically operable piston mounted in the A valve chamber 35 is naled to the front of the lathe bed and adapted to be rocked or'rotated by an operator positioned in front of the tool carriage. The rotatable valve is provided with a-series of ports to admit fluid under pressure selectively either above or below the pistons in the cylinder block 24 in different selected combinations to hydraulically actuate the res pective live spindle speed changing shifting members to secure any desired live spindle speed. A` rock shaft 37 is journaled in the headstock housing, and is manually operable by means' of a hand lever 38. The rockA shaft 37 carries three crank arms 88, 39 and 48. The crank arm 88 is operatively connected to a fluid control valve 40 adapted to admit or cut ofi1 the supply of fluid'underl pressure through a conduitV 40 to the valve located in the valve chamber 35. The crank arm 89 is connected by a link 41 to a crank arm 42 attached to a rock shaft 43, on which is mounted a beveled gear 44 located in a housing 45. The beveledgear 45 is in mesh Ywith a beveled gear 46 mounted upon ashaft 47 journaled to thel front of the lathe bed. The middle portion of the shaft 47 is of polygonal cross section, or if desired'may be a splined shaft instead. The operator by` rocking the shaft 47 from a position in front of the tool carriage is enabled .to'rock the shaft 87 and thereby actuate the valve 40,and at the same time through a crank arm 48 located Within the headstock housing to shift` a clutch to clutch a prime driving member 49 located in a housing 50 at the rear of the headstock in driving relation with the prime l200 see Fig. 12, adjustable angular-ly about shaft 52 as a center of adjustment, and held in its adjusted positions by means of a clamping `bolt 201.l The quadrant 200 is slotted to receive a stud shaft 202, which carried an intermediate gear 54.- The quadrant 200 is provided at this point in order that gears of relatively differentdiamcter may be used iuterchangeably at 55 to give variable speedl to the shaft 52.` A change of speedy at 55 is translatable at the tool carriage into a variety of speed changes at the tool. The shaft 52 is journaled to the front of the lathe bed. A screw threaded shaft 56 is y mounted rigidly upon the front of the lathe bed adjacent to the shaft 52. The shaft 56 has two separate treads chased thereon. A main tool carriage 5? is mounted upon and adjustable longitudinally of the lathe bed upon the lathe .ways The main tool carriage isprovided with ways 58 transversely thereof, upon which is mounted a cross'feed tool Acarriage 59, adjustable transversely of the lathe bed by hander by power feed by means of a cross feed screw 60. The cross feed carriage 59 is provided with ways 61 transversely of the lathe bed,V

upon which is mounted a tool post carriage 62, provided with a tool V)ost 63.

A sleeve 64v (see Fig. 3i is ourn'aled to the apron 65 of the main toolcarriage, and its bore vfits the exterior of the threaded shaft 56, so that as the tool carriage moves 'along the lathe ways, the sleeve 64 slides endwise along the screw shaft 56 and is free `to revolve. The sleeve 64 has recesses 66 and 67 to receive threaded nut segments or sections 68 and 69, which serve in pairs as aWs. One

pair of oppositely located jaws 68 engage one ofthe threads on shaft 56, and the opposite pair of opposed jaws 69 engaging with the other thread on shaft 56. To facilitate understanding of the relation of the aws 68 and 69 with the threads of shaft 56, the jaws 68 The pairs of jaws 68 are if" lil.)

Lemons o) resi-te oair of flaws 69 is in its outer osi tion, out 'of driving relation, but not entirely ont of engagement with the other thread of shift- The ente-rior of the jaws 68 and 69 provided with ribs 71 and depressions 752, nl the interior' of th-e sleeve V70 is provided with 733 vand depressions 74, yso spaced as o 'o e the ribs 73 of the sleeve .when opposite y: -l of' the jaws to force. the jaws inn i-lh fthe threads of the shaft 56. The" ed end a member attached to a pianale native to the lathe apron, and en- :ihl je sleeve 'T0 to be adjusted endWise of the I e104 te engage yand disengage the nuts 'or l and 69 in pairs with the threaded 1l-.ait o0. lThe sleeve G4 is preferably jourualed to the lathe apron by means of Timlen l s '-70. A beveled gear 77 is 4keyed to .sleeve 04, and is 'in mesh with a beveled l' TS integral with a shaft 79 journaled in 's in the llathe apron.

i led with a gear S by means 0f Which the ft may be power driven, and outside of the apron, shaft T9 Iis provided with a hand Wheel '81 by means of wh ich the shaft 79 may 'be manually rotated to thereby rotate the sleeife (S4 and jaws 68 and G9 to drive the main tool carriage along the lat-he Ways Veither to feed the tool through one of the threads on shaft or lto chase threads upon the Work, using the other thread upon the shaft 56, and

'therebyrelieving one of said threads'on shaft 56 from the strain and Wear incident to feeding the tool, and lreeping'it true and accurate for use in lthread chasing-operations. The re- Jective pairs of jaws 68 and 69 When in their retracted positions are not Ventirely retracted from engagement with the respective threads na'led to the apron. The gear 85 is adjustable axially thereof to a position out of en; gagement with the gear 84, and to another position in mesh withthe gear S4. Gear is also provided vwith clutch members vST adaojted to clutch said gear tothe teeth of a pinion SS carried rigidly on the shaft 86. The gear 82 on shaft dineshes with the pinion S8 on shaftSG.. The gear S5 is adapted to beshifterl endivise upon the shaft by means of a hand lever S9 pivotally attached to the tool carriageapron at and proand when `the depressions 74 of the 1 ar. fo is E(Fig. 2) carried by and ad- The shaft' l7 9 vided with a pin `91 engaging a shaft or pushv rod 92 movable endtvise in Vbearings in the apron.; A forked arm 93 attach-ed vto the inner end of the push .roel 292 engages an :ann.ular recess' in the hub of gear 185 to shift said gear to' diffe-rent positions endivise of .shaft 816. A lat-ch member 92'l locks the push rod 92 to its two different positions.V 'i he gear 85 is continuously' in mesh with an .elongated pinion 394 which is loose on .a shaft 9.5, jouraraled in boaringsi-n the tool carriage apron. @ne -rend 'of the pinion 194 is lprovided with rclutch members 196, and -an annular shifting recess 97., whereby the pinion 94 may be `clutched in driving relation :to fthe shaft 95 or 1disooni-i-ected therefrom, by engaging' or disengaging the clutch teeth 9 0 with `the 4cflutch members 98 mo united rigid-ly upon the shaft 95'. A

`adinstable endvvise thereon, being held to its two different positions vvof adjustment upon the shaft 102 by means of a spring actuated latch me-mberillO'l. A gear 104 is spl-ined to and adjustable endW-iseupon theV mesh with gear 10i and also an active posiltion in mesh with gear 106 splined upon the sleeve 101 ofs'haft 102. A vgear 10? is journaled loosely'upon the sleeve 101 intermediate -o'f the gears 100 and 100. The 10'? gear 99 is mounted loose-ly upon'V fthe'sh-aft 95, and is continuously in mesh with a gear 100 mountedV upon a sleeve 101, vf'fhiclfiV is loosely journaled upon la shaftI 102 andV is provided with clutch 'teeth 108 adapted td engage gthe -teeth of gear 100 to clutch the gear 107 in driving rela-tion Witli'the sleeve 101.

A gea-r 109 is journaled loosely upon U the shaft 102 at the opposite end ofgear 100.`

Gear 109 is provided With clutch teeth 110 adapted `to engage the teeth of gear 100 to clutch the gear 109 in driving relation to the sleeve 101.

Adjacent to the shaftf102is a sli-aft .112

journaled in bearings 'in the apron 65. The

shaft 112 has splined thereto a cone of gears if* 114, compri-sing a sericsof approximately eight gears of relatively different vnumbers of teeth. The gear 10i meshes with one ofv 'these cone gears, and the gear 109 fmeshes with another of said cone gears. An an-nui lar rack` 115 is attached v'to one yend of the sleeve 10'1, 'and said annular rack is engaged by ra segmental gear 116 .mounted upon a rock shaft 117, adapted to be shifted by means of a hand level' 118 froman intermediate idle position shown in full line in Figs.

Y3 and 4, to anr active position atene side shown 1n dotted line, with the gear107 lclutched to the gear 100, orto an active 'position indicated inv dotted A.line at 'the op v`posit-e. side With the gear 109 clutched to the sleeve gear 101,"thesleeve 101 being latched to the shaft 102 in either' one of its two active positions by the latch member 103.

shaft 120 is journ aled to the apron 65, and is provided with an elongated gear 121 keyed thereto opposite the cone of gears 114. A setting lever 122 is provided With a latch member 122 to latch it to different positions relative to vthe cone of gears ,114, and with reference to the apron 65, and alsoprovided With a shaft 123 ournaled in forked arms of said setting lever 122. The shaft 123 has journaled thereon a gear 124 which is continually in mesh with thegear 121, and is adapted to be adjusted in a planetary direction about the gear 121, and also longitudinally of the gear 121, to thereby enable the gear 124 to be selectively mashed With any one of the gears of the cone gear 114 to drive Vthe shaft 112 and the train of gears receiving motion therefrom at relatively `wide of different speeds.4 .fr beveled gear 125 on the slrl ft 120 is driven from the splined shaft I 52 selectively vin either forward or reverse direction through either one or otherof the beveled gears 126 and 12T loose on the shaft 52 and journaled to the apron so as to slide along the shaft 52 as the maintool carriage moves along the lathewvays. '1i sleeve 128 splined to the shaft 52, and located intermediate of the gears 126 and 127 is provided at one end with a single tooth clutch member 129 to engage a clutch member130 carried by the gear 126 to clutch the gear 126 in driving relation to the sleeve 123 and shaft The sleeve 123 is provided at its opposite end with a single tooth clutch member 131 adapted to engage a clutch member 132 carried by the 12T to clutch the gear 12T in driving relation with the sleeve 123 and the shaft 52. A shifting lever 133 is adapted to be n'ianually operated to actuate a push rod 134, see 1, 3, 6 and 7 which in turn shifts a forked arm Which engagesan annular recess 136 in the sleeve 123 to shift said sleeve endivise relative to the apron and the gears 126 and 127 to clutch the shaft 121 in either kforward or reverse driving relation wWith 'the shaft 52.

A manually operable shifting lever 131, see Figs. 3 and S, is pivotally mounted uponr the y front of the apron, and is provided with. an

CII

arm 13S engaging a recess 139 in the end of a push rod 140 Which is mounted to move end- Wiso in bearings in the apron. At its inner end the push rod 140 is provided Witha forked arm 141 which engages an annular recess 97 of the gear to shift said gear 94 endivise on its shaft Yi-:iiring actuated latch member 142 holds the push rod 140 to either one ofits tivo positions of adjustment. Vlhe lever 13.7 is used-'for stopping and starting the feed, as it controls the power line'` which is through but a single gear 94, which Yin turn meshes with gear 85 on the shaft- 86.

A. manually operable' shifting lever 144 is pivotally mounted upon the front of the pron, and is attached by a crank pin 145 with a push rod 146, mounted to move endvvise relative tothe apron. At the inner end of the push rod 146, is a forked arm 146 Which engages upon opposite sides of the gear 104, anfdis adapted to shift said gear-.104 endvvise on its shaft 95 from an intermediate idle position to a *positionl with the clutch members 106 in engagement With the clutch members 105, or to a position with the gear 104 inA mesh with thel gear 106. A spring actuated latch member 147 serves to latch the gear 104 and its push rod 146 to its three respectivepositions of adjustment. A push rod 143 is adjustable eudwise Within the bore of the shaft 33, and is provided with a pin 149 through the Ahub of gear 32 and havlnnited movement endwise of shaft 83m a slot 149. The push rod 148 serves to selectively engage gear 32 with gear 80. on shaft T9, or with gear 150 mounted on the cross-feed screw 60 to enable kthe Vcross feed carriage 59 jolie power driven when required. The shifting lever 133 has au interlocking connection :152, see 6 and with the sliding bar 75 cans-:e the position of the sliding bar and the clutch members 129, 130, 131, and 132 to restrict or limit the range of movement of the lever 133.

lvfounted upon the top ofthe main tool carriage .is a grid shaped frame 153, and beneath said frame is an index plate 154, which carries two separate inde): tables, one shown in Fig. 10, to indicate the position of the various shifting levers and driving melnbers to secure the various speeds for feeding the. tool,Y and the other shown in Fig. 9 to indicate the respective positions of the various shifting levers and driving members to chase threads of various pitches. This index plate is adjustable beneath the grid frame to show one index table through the .grid at one extremity of the movement of the index plate :154, and to expose the other index table through the grid frame at the opposite extremity of the movement of the index plate 154. A. manually operable lever 155 is attachedto one end of a rock shaft 156, journaled to the main tool carriage, and adapted to rock said shaft through one hundred. and eighty degrees.. At its inner end ,the shaft156 is provided With a crank pin 157 on which is mounted an antifriction roller 153 seated in a transverse slot in the slide :bar 75, whereby the. lever 1,55 may be emrelativeto its grid frame 150 sufliciently to alternately display' the respective index tables, depending upon the position 'of the sleeve 70 and the aws 68 and 69.V 'i

lilountr-d upon the lower edge of thetool carriage apron a housing 163, in which is mounted a beveled gear 1611, the tubular hub 165 of which is journaled to the housing 163 and splined to the shaft 36, which serves to rotatably adj ust the valve in the liuid'presf sure valve chamber rlher gearh16el and hub 165 slidealong the shaft 36 as the tool carriage moves along the lathe bed. A beveled gear 166 journaled in thev housing 163 meshes ivitn the gear 16e. The shaft 167 to Which the gear 166 is attached extends up- Wardl y to the top of the tool carriage, Where along the lathe bed.

it is provided With a polygonal Wrench seat 16S engaged by a detachable hand Wrench 168, and an index plate 169, by moans vof which using wrench 168 the shafts 166 and 36 and the valve in the valve chamber 35 may be adjusted to any predetermined position and such position of the valve indicated f upon the index plate 169. A sleeve 170is j ournaled in the housing 163 With the shaft L7 passing through the polygonal bore thereof, and said sleeve adapted to slide endWise' of vt ie shaft e17 as the tool carriage moves il hand lever 171 is zittached to the sleeve'170 and is operable -to rocl the shaft L17 to thereby rock the shaftv 37 Vto admit fluid under pressure to the valve chamber 35, and also to shift the crank arm 4S to shift aclutch and brakeA mechanism Within the headstock` housing 18 to thereby start and stop the prime driving shaft ofthe trainof shafts and gear mechanism employed to drive the live spindle 19. It Will be noted that by resetting the position of the shafts 166 and 36 While the tool'is in the act of carrying out one operation, the valve in the valve chamber is adjusted'to a nenr position, but no change in the'speed of the live spindle 19, or in the shifting mechanism controlling movements Within the headstock occurs until after the handlever 171 has been actuated to stop the rotation of the spindle 19 and the feed of the tooll carriage, whereupon during the interval of rest of the live spindle 19, the fluid pressure .acts uponthe selected pistons in the cylinder block 24, to secure an autorigidly tothe lathe Ways by means of clamping screws Permanent stop members 224: and .225 are mounted rigidly upon the 'Ways 16 to limit the extent of the range vof adjustment of the stop members 221 and 222,. The slide bar 75 is mounted relative to the tool carriage to have a limited sliding movement, and opposite ends of said bar project sufficiently beyond the limits .of the tool carriage to be in position to first engage the respective stop members 221and 222 at opposite limits of the prescribed feed of the tool car! ringe, te thereby shift the bar 75 relative to he tool carriage and thereby by shifting the sleeve V128 and theciutch members 129 and 131 endivise of the shaft 52, to disengage thel s 1 n n L u sleeve 128 from driving engagement` With the 126, or from driving' engagement With .the gear 127, .and thereby stop the tool carriage feed. The permanent stop members 2211 and 225 prevent the adjustable stop members 221 and. 222 being inadvertently set too far away from the tool carriage to serve in stopping the toolv carriage feed before the tool carriage-contacts'with the headstock or With thetail stock to thereby Vcause injury to the lathe, or tool. s Y

The apparatus herein illustrated and described is capable of considerable modifica-VV tion within the scope ofthe claims, Without departing from the spirit of myinvention. l.Vhat I claim is; 1. A machine tool comprising a. bed', a Worlr spindle carried thereby, a tool holder movable along said'b'ed, athreaded shaft mounted stationarily along said'bed, a tool holder lriving shaft mounted'rotatably along said bed,A members carried by saidl tool, holder Ypositioned radially about said threaded meinber an d adaptedv to selectively engage-said threaded shaft to ,feed said tool holder along Y said bed, a train Aof driving members carried by said tool holder adapted to transmit motion from -said tool holder driving shaft to ,said Vthreaded shaft engaging members't-o vpropel said tool holder along said bed, means to indicate which ofsaid members is in driving relation With said threaded member, and a shift'a'ble member included in said train of driving `members adapted to engage and dis# engage said tool holder driving-shaft in driv ing` relation with said threaded shaft.V

2 A machine toolcomprising a bed, a Work spindle carried thereby, a tool holder movable along said bed, a threaded shaft mounted stationarily along said bed` a tool holder driv- Y ing shaft mounted rotatably along said bed,

members carried by said tool holder posi,-

tioned radially about said threaded member and adapted to selectively engage said threaded shaft to feed said tool holder along said` bed, a train of vdriving members carriedby ysaid tool holder operable to vtransmit motion from saidrtool holder driving shaft to said threaded shaft, manually operable means adapted to transmit motion to said threaded shaft engagingmeinbers,i.and a shiftable iis f memberv operable to selectively connect said manually operable member or said tool holderclriving shaft in driving relation 'ivith said threaded shaft engaging member', and means to indicate which of said members is in drivinglrelation With said threaded member.

'3. A machine tool comprising a bed, a work spindle carried thereby, 'a tool. holder i movable along said bed, a. threadedshaft mounted stationarily along said bed, members carried by said tool holder positioned radially 'aboutsaid threaded member and adapted to selectively engage saidthreaded shaft to feed said tool helder along said bed, f a manually operable tool holder feeding member mounted upon said tool holder, and a tra-in' of driving members carried by said tool holder and operatively connecting said threaded shaft engaging members with said manually operable member, and means to indicate ivhieh of said members is in driving relation With said threaded member.

fl. A machine tool comprising a bed, a work spindle carried thereby, a tool holder movable along said bed,` a'tli1eaded`sliaft mounted stationarily along said bed, .and provided With a pluralityl of threads, Ya plurality of thread engaging members arranged at right Vangles to each other, each continuously in mesh with a thread nponsaid theaded shaftLmeans about said thread engaging members operable to shift said thread en* gaging members selectively into driving relation with said threaded shaft-,and means to drive said thread engaging members vto feed said tool holder along said bed, and means to indicate which of said members is in driving relation with said threadedmember. l

5, A machine tool comprising a bed, a Work spindle carried thereby, aA tool holder movable along `said bed, a threaded shaft mounted stationarily along said bed, and provided With a plurality of threads, a plurality of thread engaging members arranged at right angles to each other in juxtaposition -member included in said train of driving members operable to engage and disengage said tool holder driving shaft in driving relation with said threaded shaft, and means to indicate which of said members is in driving relation with said threaded member.

6. 'A Vmachine tool comprising a` bed, a Work spindle carried thereby, a. tool holder movable along said bed, a threaded shaft mounted stationarily along said bed, and provided; with a plurality ofthread', a plurality of thread engaging members each continuously in lmesh with a thread upon said driving relation with said threaded shaft, an Y Y adjustable index member adapted to indicate which of said ,thread engaging members is in driving relation with said threaded shaft and means operable in unison with the movements of said thread engaging members to shift said index member. i 7. A machine tool rcomprising a bed,.a Work spindle' carried thereby, a tool holder movablealongysaidbe'd, a threadedshaft mounted stationarily along said bed, a tool holder driving shaft mounted rotatably along said bed,*members carried by said tool holder positimicdradially about said threaded member and adapted to selectively engage said threaded shaft to feed said tool holder along said bed, a train of driving members carried by said tool holder adapted to transmit motion from said tool holder driving shaft to said thread engaging member to propel said tool holder along said bed, and a reversing member included in said train of driving members operable to feed said train of driving members selectively in forward or reverse direction, and means to indicate which ofisaid members is in driving relationl with said threaded member. i

8. A machine tool comprising a bed, a Work spindle carried thereby, a tool holder movable along said bed, a threaded shaft mounted stationarily along said bed, a tool holder driving shaft mounted rotatably along said hed, members carried by said tool holder adapted to selectively engage said threaded shaft to feed said tool holder along saidA bed,a train of'driving members carried by said tool holder adaptedto transmit motion from said tool holder driving shaft to said thread engaging member to propel said tool holder along said bed, and shiftable speed changing members included inr said train of driving members operable to vary the speed of the tool holder feed relative to the speed of the work spindle, and means to indicate Which of said members is in driving 5 tive to the speed tively into driving relation With `said.

threaded shaft a trainof drivinemembers i propel said tool holder along shiftable speed changing members included 1n said train of driving members operable to the tool holderfeal relaof the Work spindle, and 4means to indicate which of said members in driving relation with said threaded member. i

l0. A machine tool Comprising a bed pro vary the speed of 'I vided Wit-h stop members to dennel the limits of a toolholder feed thereon, a work spindle carried by said bed, a tool nolder` movable along;r said bed intermediate of said stop members, a. threaded shaft mounted station arily along` said bed, a tool holder driving shaft mounted. rotatably ,along said bed, thread engaging members Carried by s .l tool holder adapt-ed to selectively engage the thread of said threaded shaft to feed sain tool holder along said bed, a train ofrdrivingg members carried by said tool holder adapted to transmit motion from said tool holder driving shaft to sai(v engaging; member, and a shiftable meniber inelnded in said train of driving' members operable by engagement with said stop members on said bed to dsengage said thread enga ging member from driving relation vfitl said tool holder driving' shaft autoniatieally at opposite limits ofthe prescribed' feed ot said tool holder, and means to i dieate which of said members is in driving?, relation with said threaded member.,

l1. A machine tool comprising a bed, a

^ Work spindle Carried thereby, atool holder movable along said bed, a threaded shaft mounted stationarily along said bed, and previded with a tool holder feedine' thread and a thread chasing' thread, a plurality of thread engaging' members eaeh Continuously in mesh 'ith a thread upon said readed shaft ant eaeh shift-able into and ont of driving relation with said threaded shaft, a tool holder drivimg,` sha-ft rotatably mounted along' said bed and driven from said work spindle, train of driving' members Carried by said tool holder operable to transmit motion from said tool holt er driving` sha-ft to said thread engaging members, means operable to shift said thread engaging members selectively into driving relation with the tool holder feeding' thread or the screw chasing" thr'fad of said threaded shaft, tool holder feeding' index table, an independent thread elia-sing index table, means operable in unison With the movements of said thread engaging members to alternately display said tool holder feeding' index table and said serew thread chasing` index table, and a shiftable member included in said train of drivingmembers op- Vmoan-ted stationarily alone; said bedandrproerable to engage and disengage said tool holder driving shaft in driving relation With said threaded members. i

l2. A machine tool,Comprising a. bed, a verh spindle ear 'ied thereby, a tool holder "f movable along; Vsaid bed, a threaded shaft mounted stationarilj-,' along said bee and pro yvided with a tool lmlder feeding thread and ser-ew chasing' thread, a plurality thread engaging` members each v continuously' in mesh with thread upon said threaded shaft a rd ea h shiftableinto and out of driving;l relation with saidV threaded shaft, a tool r d ri ving shaft rotatably mounted along d and driven from said 'Worn spindle, lill? a tra-in of driving memberscarried by said tool holder operable to transmit motion from said tool holder driving; shaft to said thread 'ng members, va member shiftable to seleetively engage respective thread engaging members in driving' relation with tie tool holder feeding' thread or the screw hread chasing thread of said threaded shaft, shiftable speed Changing;` members Vear 'ieid by said tool holder operable to Change the speed of said threaded engaging member relativeto saleL tool holder driving shaft, and shitt able member opi ble to engage and disenp'age said threadengaging members in drivy infr relation With ytool iolder driving il) shaft. 1 Y v 13. er machine tool Com'pr'sng a bed, a v 11 1+ .Q ""i'y no-.lz spincne Carries thereby, a tornio ei i movable along` said bed, a threaded i ftV vided with a plurality of threads, a plurality of thread engaging' members each continuousy ly in mesh With a thread npon said threaded shaft, means to drive said thread engaging members to feed said tool holderalong' said bed, shiftable means operable manually to shift said thread engaging members seleetively into driving relation With said threaded shaft, a plurality of index tables operatively connected withv said shiftable means and shiftable therewith to display one inde); table at a time to Correspond With the thread engaging member in driving relation with said threaded shaft, and shiftable n eans operable to ystart and stop the feed of said thread *M5 engaging members.

1l. A machine tool Comprising' a bed, a Work spindle rotatablymonnted thereon, a tool holder movable along' said bed, a threaded shaft mounted stationaril alone' said bed tj 3 thread engaging members iu driving relation with the tool holder feeding thread or with the screw thread chasing Vthread of said threaded shaft, shiftable speed changing members Carried by said teal holder operable to change the speed of said thread engaging members relative to said tool holder dri ing shaft, a shiftable member movable with said tool holder operable to engage and disengage said thread engaging members in driving relation With said toolholder driving shaft, and

a shiftable member movable with said tealy holder operable to stop and start said wor-l spindle.

15. A machine tool Comprising a bed, a work spindle rotatably meunted thereon, shiftable speed changing members operable to vary the speed of said Work spindle, a tool holder movable along said bed, a threaded shaft mounted stationarily along said bed, and provided With a tool holder feeding thread and a screw Chasing thread, a plurality of thread engaging members eaeh continuously in mesh With a thread upon said threaded shaft and each shiftable into and out of driving relation With said threaded shaft, a tool holder driving shaft rotatably mounted along said bed and driven from said Work spindle,a train of driving members carried by said tool holder operable to transmit mov tion from said tool holder driving shaft to saidthread engaging members, a member shiftable to seleetively engage respective thread engaging members in driving relation With the tool holder feeding thread or with the screw chasing thread of said threaded shaft, shiftable speed Changing members carried by said tool holder operable to change the speed of said thread engaging members relative to said tool holder driving shaft, a shiftable member mevable With said tool holder operable to engageand disengage said thread engaging members in driving relation with said tool vholder driving shaft, a shiftable member movable with said tool holder operable to stop and start said work spindle, and a shiftable member movable With said tool holder operableto change the speed of said Work spindle and said tool holder driving shaft.

16. A machine tool comprising a bed, a Work spindle Carried thereby, a tool holder' movable along said bed, a threaded shaft mounted stationarily along said bed provided with a pair of threads, a plurality of thread engaginginembers, means operable to shift said thread engaging members selectively into driving relation with said threaded shaft, an adjustable index member adapted to indicate Which of said thread engaging members is in driving relation with said threaded shaft, operable in unison with the movements of said thread engaging members to shift said index member and means for predetermined the limit of movement of said tool holder.

In testimony whereof Iliave affixed my signature.

WILLIAM L. SCI-IELLENBACH.

'all 

